Which of the following is the least common ecosystem on Earth?
a. Freshwater
b. Terrestrial
c. Shallow ocean
d. Deep ocean bottom
a. Freshwater
Freshwater ecosystems are the least common ecosystem on Earth.
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Which neurotransmitter diffuses across the synaptic gap, rather than being released by synaptic vesicles?
1.Dopamine 2.Gammaaminobutyric acid (GABA) 3.Nitrous oxide (NO) 4.Serotonin
The type of viral infection in which a virus enters a host cell, immediately replicates, and causes the host cell to burst is
A. a rare form of viral infection. B. a transgenic infection. C. a lysogenic infection. D. a lytic infection. E. a systematic infection.
After fertilization, which hormone is secreted by the developing embryo to maintain the function of the corpus
luteum? a. GnRH b. FSH c. hCG d. ACTH e. LH
The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K+ ions. How can K+ ions continue to enter the cell?
A) Exocytosis B) Active transport C) Osmosis D) Infusion E) Facilitated diffusion